Fixed main activity errors and added click function to start

GalleryActivity. Started working on GalleryActivity.

HW4/res/layout/activity_gallery.xml

@@ -0,0 +1,18 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    tools:context="com.example.hw4.GalleryActivity"
+    tools:ignore="MergeRootFrame" >
+
+    <GridView
+        android:id="@+id/gallery"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:numColumns="4" >
+    </GridView>
+
+</LinearLayout>
+

HW4/res/menu/gallery.xml

@@ -0,0 +1,12 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context="com.example.hw4.GalleryActivity" >
+
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:title="@string/action_settings"
+        app:showAsAction="never"/>
+
+</menu>

HW4/res/values-w820dp/dimens.xml

@@ -0,0 +1,10 @@
+<resources>
+
+    <!--
+         Example customization of dimensions originally defined in res/values/dimens.xml
+         (such as screen margins) for screens with more than 820dp of available width. This
+         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively).
+    -->
+    <dimen name="activity_horizontal_margin">64dp</dimen>
+
+</resources>

HW4/res/values/strings.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
+    <string name="action_settings">Settings</string>
     <string name="app_name">UNC Charlotte Photos</string>
     <string name="title_activity_main">Main Activity</string>
     <string name="menu_settings">Settings</string>
@@ -210,4 +211,6 @@
         <item>http://farm9.staticflickr.com/8372/8481740075_c3e1c3a7b2_z.jpg</item>
     </string-array>
 
+    <string name="hello_world">Hello world!</string>
+
 </resources>